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Search: id:A061370
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| A061370 |
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a(n) = floor[ratio of product and sum of first n numbers]. |
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+0
1
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| 1, 0, 1, 2, 8, 34, 180, 1120, 8064, 65978, 604800, 6141046, 68428800, 830269440, 10897286400, 153844043294, 2324754432000, 37440781904842, 640237370572800, 11585247657984000, 221172909834240000, 4442690623626907826
(list; graph; listen)
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OFFSET
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1,4
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FORMULA
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a(n) = floor[2*(n-1)! / (n+1)]
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EXAMPLE
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a(6) = floor[720/21] = 34.
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MATHEMATICA
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Table[ Floor[2*(n - 1)!/(n + 1)], {n, 1, 24} ]
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CROSSREFS
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Adjacent sequences: A061367 A061368 A061369 this_sequence A061371 A061372 A061373
Sequence in context: A030871 A030960 A121894 this_sequence A126328 A013026 A121789
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KEYWORD
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nonn,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 02 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), May 07 2001
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